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Semiconductor and Electronic CircuitsYong Heui Cho @ Mokwon University

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Electronic Circuits

1. Semiconductor & Electronic Ckts

2. Introduction to Smart Sensors

3. Basic Circuit Theory

4. Diode Operational Principle

#Semiconductor

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Wave Theory of CivilizationFirst Wave (10,000 ~ 3,000 B.C.)Agricultural revolutionStone - bronze - ironThird WaveInformation revolutionSiliconSecond WaveIndustrial revolutionSteel and steam

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Computer EraICT serviceInternetComputerCPU (Central Processing Unit)Logic CircuitsAnalog Circuits (Electronic Circuits)TransistorsSemiconductorSilicon (sand)

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SemiconductorMisunderstandingHalf of conductor, half of insulator Correct definitionVoltage controlled conductorDepending on voltage, semiconductor is conductor or insulator

#Vacuum TubeA bulb which can compute and thinkInvented by Fleming (at 55) in 1904

#ENIACThe first general purpose electronic computerElectronic Numerical Integrator and CalculatorDeveloped by Eckert (student) and Mauchly (professor) for 1943-1946Supported by von NeumannWeight = 27 tons# of vacuum tubes = 17,468# of soldering = over 5 millions

#Debugging of ENIAC

#Weakness of BulbsLarge heatLow power efficiencyShort lifeFragility

#Sand is Solution!Semiconductor substrate is made of sand.Silicon is 2nd most abundant on Earth.Wafer is almost perfect insulator.

#Doping ProcessAdding impurities to silicon (Si) dramatically changes electrical behaviors of semiconductor.N-type: P, AsP-type: B, Ga

#Invention of TransistorTR (Transistor)Trans + ResistorInvented by John Bardeen (at 40), Walter Brattain (at 46), and William Shockley (at 38) in 1948 at Bell Labs

first TR

#First All-TR Car Radio

at 1955

#SolderingMass production (?)

#Integrated Circuit (IC)Invented by Jack Kilby (at 35) in 1958 at Texas Instruments

#Semiconductor Process

#Electronic Circuits

#Passive Devices

resistorinductorcapacitor

relay

transformer

#Active Devices

transistorFET

IC

diode

#Circuit Diagram

#PCB ArtworkPCB (Printed Circuit Board)

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